pos += 4;

        // Write payload data: input then output
        if (inputCount > 0 && inputBytes != null) {
            System.arraycopy(inputBytes, 0, buf, pos, inputCount);
            pos += inputCount;
        }
        if (outputCount > 0 && outputBytes != null) {
            System.arraycopy(outputBytes, 0, buf, pos, outputCount);
        }
        return buf;
    }

            return a;
        }
        @SuppressWarnings("unchecked")
        final T[] array = (T[]) Array.newInstance(a.getClass().getComponentType(), a.length + b.length);
        System.arraycopy(a, 0, array, 0, a.length);
        System.arraycopy(b, 0, array, a.length, b.length);
        return array;
    }

    /**
     * Returns an array that is the concatenation of two arrays.
     * <p>

        // Set number of entries
        setNumEntries(response, 1);

        // Write share name (13 bytes, null padded)
        byte[] nameBytes = shareName.getBytes(StandardCharsets.US_ASCII);
        System.arraycopy(nameBytes, 0, buffer, bufferIndex, Math.min(nameBytes.length, 13));
        bufferIndex += 14;

        // Write type (2 bytes)
        SMBUtil.writeInt2(shareType, buffer, bufferIndex);
        bufferIndex += 2;

        int pos = 0;
        System.arraycopy(avFlagsData, 0, fullData, pos, avFlagsData.length);
        pos += avFlagsData.length;
        System.arraycopy(avTimestampData, 0, fullData, pos, avTimestampData.length);
        pos += avTimestampData.length;
        System.arraycopy(avTargetNameData, 0, fullData, pos, avTargetNameData.length);
        pos += avTargetNameData.length;
        System.arraycopy(eolData, 0, fullData, pos, eolData.length);

            offset += 2;
            System.arraycopy(domain, 0, targetInfo, offset, domainLength);
            offset += domainLength;
        }
        if (serverLength > 0) {
            writeUShort(targetInfo, offset, 1);
            offset += 2;
            writeUShort(targetInfo, offset, serverLength);
            offset += 2;
            System.arraycopy(server, 0, targetInfo, offset, serverLength);
        }

        String fileName = "test.txt";
        byte[] fileNameBytes = fileName.getBytes("UnicodeLittleUnmarked");
        SMBUtil.writeInt4(fileNameBytes.length, buffer, notifyOffset + 8); // FileNameLength
        System.arraycopy(fileNameBytes, 0, buffer, notifyOffset + 12, fileNameBytes.length);

        // When
        int bytesRead = response.readBytesWireFormat(buffer, offset);

        // Then
        assertTrue(bytesRead > 0);

        assertEquals(fileName.getBytes(StandardCharsets.UTF_16LE).length, nameLength);

        // Verify file name
        byte[] nameBytes = new byte[nameLength];
        System.arraycopy(buffer, 20, nameBytes, 0, nameLength);
        String decodedName = new String(nameBytes, StandardCharsets.UTF_16LE);
        assertEquals(fileName, decodedName);

        // Verify bytes written

        assertEquals(0, SMBUtil.readInt4(buffer, offset + 4));

        // Verify file ID is copied correctly (16 bytes starting at offset+8)
        byte[] copiedFileId = new byte[16];
        System.arraycopy(buffer, offset + 8, copiedFileId, 0, 16);
        assertArrayEquals(testFileId, copiedFileId);
    }

    @Test
    @DisplayName("writeBytesWireFormat with null file ID should handle gracefully")

        int bufferIndex = 0;
        int start = 0;

        // Write server name (16 bytes, null padded)
        byte[] nameBytes = serverName.getBytes(StandardCharsets.US_ASCII);
        System.arraycopy(nameBytes, 0, buffer, bufferIndex, Math.min(nameBytes.length, 15));
        bufferIndex += 16;

        // Write version major (1 byte)
        buffer[bufferIndex++] = (byte) versionMajor;

        }
        byte[] packet = new byte[totalLen];
        System.arraycopy(header, 0, packet, 0, header.length);
        System.arraycopy(body, 0, packet, SMB2_HEADER_LENGTH, body.length);
        if (ctxOffsetFromHeader != null && ctxBytes != null) {
            System.arraycopy(ctxBytes, 0, packet, ctxOffsetFromHeader, ctxBytes.length);
        }
        return packet;
    }